WP13324 Fix h1cdsh8 20bit-DAC

Marc, Fil, EJ, Tony, Dave:

Thursday 11jun2026 work was done on h1cdsh8 to fix its first 20bit-DAC. Prior to this we verified, using h1susfc2 and iop drives, that all 7 channels being used were broken by the timing card upgrade 13apr2026.

We had two options: move all the IO-cards one slot to the left, or downgrade the timing-card firmware. For h1cdsh8 we decided to do the latter. (Note that h1sush7 and h1oaf0 were fixed with the former).

After powering h1cdsh8 down, EJ worked on documenting the BIOS settings for this W22-45 computer. This is to investigate the W22-45 issue we are seeing in the EE shop in which the combination of 0x635 and 20bit-DAC prevents the IOP model from running.

I went to the IO-Chassis in the Filter Cavity End Station building (FCES) and removed the 0x635 card (S2101106) and replaced it with a 0x1f0 card (S2101117) which Marc had reprogrammed.

The only issue was moving the Avago Single Mode SFP from the old card to the new. This SFP was damaged, its pull bar had broken off. Taking the card back to the EE shop, Fil was able to extract the SFP. I found an equivalent spare SFP (the last spare) which is complete with its pull bar.

We think the only difference between the TLZ and the TPZ is the plastic locking mechanism.

Following the upgrade I tested ch7 using the IOP's Duotone loop-back, this is working now (did not work this morning). Tony got h1susfc2 driving again, but I was unable to get the FASTIMON aux channels to verify ch0-5 were driving.

Fil and I went to the IO Chassis and verified ch0-5 were working using a breakout board and DVM. We verified the binary cards were working and that all the SUS chassis were operational. We are handing FC2 over to SUS for verification.